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ozzie, i bought the same truck a few months back. love it! the tow/haul can be engaged at any speed. i have 10000 mi and an getting a little over 17 mpg. i have not used any type additives so far. had a chevy tech from factory tell me its a waste of money. i tend to belive him.the 17 mpg is NOT towing. get almost 13 towing 3075 montana. 33' long, and around 10.500 weight. hope this helps some. happy camping.
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